Oil switch with rotatable contact bridge



July 11, 1933. F. HQUT 1,917,887

OIL SWITCH WITH ROTATABLE CONTACT BRIDGE Filed March 5, 1931 Han} HouglcVENrom x MM.

Patented July 11, 1933 o 'UNE'EED STATES PATENT OFFICE FRANZ HGU-l, OFPILSEN, CZECHOSLOVAKIA OIL SWITCH WITH BOTATABLE CONTACT BRIDGEApplication filed March 3, 1931, Serial No. 519,744, and inCzechoslovakia October 10, 1930.

This invention relates to an improved oil above-described disadvantagesto be obviswitch with a rotary motion contact bridge, ated, and at thesame time a number of conand in particular to a three phasearrangestructional improvements in oil switch dement of the same withina. single container. sign to be achieved.

The hitherto known designs of oil switches For the purpose oi enablingthe lead-1n with a contact bridge rotatably movable on bushings to bebrought closer together, witha horizontal plane could only as a rule beout danger oi collision between the rotatable employed in connectionwith single phase Contact bridges, these la'tterare dlsposed, in oilswit hes with upright cylindrical tanks. accordance with the invention,in dii lerent T k f thi t are l d i oth r planes. The above-mentionedshortening of 60 forms of oil switches, mainly for mechanical the areover path between the contacts of reasons, although in these cases thesiace each phase, due to theprcsence of themetalllc ithi th t k i t tilid t h d s1 pportnig element, in the circuit-breaking advantage as in thecase of the design with Lion is obviated by the employmentof iii a mt blbl t t b id suitably arched or curvedrontact bridges. 65 Theconstruction of three phase oil t further constructional improvementofswitches, having all three phases arranged i'ected by the inventionconsists 1n eliminatin a single tank and employing rotatable cong e spcial S] )r1ng heretofore used for tact bridges, has hitherto beenattended with the a ing or the clrcuit-break ing movedifliculties,particularly in the matter of (11- 11181145 Of Elle Contact bridge, andin the emniensioning, since it has been necessary to 1 95 6 13 for thispurpose, 1n con unction rovide uch clpara nce betyveell the Single,Vltll ZlpiJl'Qpl'lflDG ZlCCQSSOl'y lnQl/nS, of the phases that, in thecircuitbrealnng position, spring which serves to maintain the con- N inwhich the contact bridges are generally at flc ng pressure between thecontact bridge W la: right angles to the Plane on hi h th l dand thecontacts pf the leads-1n.

in bushings of the separate phases are dis- A11 9311111316 9* threephase 011 switch posed, the contact bridges do not strik in accordancew1th the present lnvention is against each other; the efforts hithertomade SHOWH agl lnnmtlcally 111 the accompanyby designers to comply withthis reqruredl'tlwmga m Winch so ment have led to unnecessarily largedimen- 1 is a tiimswrse Section Of the h, sions for the containers.Further, when 1 5," Q ShOWSS t same Switch partly in straight-linecontact bridges have been emlongltudllml 3991310117 and p y 1n SlCleelepl ved, the metallic support for the contact fi L bridge causes theare over path between the I: 23" 3 p 'f 9- SWltCh, as Seen r contacts ofone phase to be shortened, which l above: 111 P Section and P QIQWL- isparticularly noticeable in the case of medi- 1 hl i 1 y 1 t 1 f I umvoltages up to 30 kilovolts, at which volt- 1535' 1 a1 5 0 t 16Construcages the individual lead-in bushings could 32 2, i t e ci 0 t1 tI 40 otherwise be arranged nearer together, in 611mb 0 1e (lwwlne 16 )10ed in accordance with the invention is mew OI the Shorter are Over pathto be in the form of a longitudinally disposed cyllowed inder 1 whichcontains the entire circuiti; drilwbacks have hltherto Preventedbreaking mechanism. This shape of tank is the utlhmtmn of the Mwanmgesto be most suitable from the point of View of pow- 45 mined y the use ofl'otambly movable er of resistance to internal pressure, as in the tactbl'ldges in Connection with Voltages 1111 case of the existing singlephase switches, the der 3 kilOVOltS, at which Voltages it is usual spacewithin the thnl; being at the same time to arrange all three Phases WiEL Single particularly advantageously utilized. The container. contactbridges 2 of the separate phases are 0 The present invention enables allthe arched in accordance with the invention, so

that the dstances Jetween the leads-in of one of the nose and the stop,at which point the phase, 0. g. lJQtY-KGQD the leadsan and 3, brakingaction is completed.

within the tank err he reduced to the lo vest It will be clear that theactual construclimit adn issihle i ployed, witho t over path by contactbridges tion of the switch. For the bling the intermediate dist-aleads-in 3, 4-, and 5 of the s 1) be reduced. as far ossible ratecontact bridges are dis nice with the invention, on l'ere I, as shown inFig. 2, so tln ridges during the circuit-breaki 1 c movcnien pass overor beneath each other.

It will be clear that, by this arrangement of the component par s, thedimensions of the tank can be kept down to a minimum, while theinsulating clearances utilized to the best possi lo advantage.

For the purpose of braking the circuitbreaking movement of the contactbridges and. of shafts 7 whicl are of ins dating; material the spring:8, which maintains a and constant pressure between the COHZZLCJLS 9 thecontact br dges 2, is emp To the l d of the tank there is attacned amember which is provided with a stop 10 the arresting surface ll. ofwhich is suitably inclii'ied in relation to the middle axis of the shaft7. The shaft sn pport with. which the operating: rod 13 is adapted toengage, is rigidly eonnected to the shaft 7, and, is provided with alaterally proiectinafnose 14 which bears on the inclined arres-aingsurface of the stop 10 during the circuit-breakin22 movement of theswitch. In consequence of the angle of inclination of the bearingsurface 11 of this stop the spring 8 compressed. and at the same time abraking: action exerted on the movement clearance is occrmied ugon theengagement limited by tion of the switch herein d scribed andillustrated is apahlc of various modifications as to detail, withoutalteration of or departure from the essential nature of the improvementsprm 'idcd by this invention. t will also be clear that the individualhaiurrs of the invention can be applied separately, and as such provideadvantages over misting c1lrrent practice, while multiple advantages2iccrue from the employment of all these features in combination.

I claim l. A polyphasc oil switch comprising; a tank, a plurality ofshafts spaced lengthwise of and depending within the tank, and rotatablecontact bridges supported by raid t by said lid and depending within thetank,

and rotatable contact bridges supported by said shafts at differenthori'lzontal planes within the tank.

3. A polyphase oil switch comprising a tank, a pair of fixed contactstherein, a shaft of insulat ng material disposed intermediate the fixedcontacts, a metal support carried by the shaft and spaced from the planeof the fixed contacts and a contact bridge carried by said metalsupport, said bridge being: curved to contact with the fixed contacts.

4. A polyphase oil switch comprising a tank, a shaft, means sup portingsaid shaft to limi (1 spring to urge the shaft axially in one direction,and a cam device comprising a cam and cam surface on the shaft and onthe tanle switch opening; mo ement and so disposed as to shift the shaftaxially against the urge of the spring whereby a braking effect isobtained.

In testimony whereof I ailix my signature.

FRANZ HoUsT.

axial movement thereof. a.

